/*
   Copyright (c) 2011 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2011-02-05 Marco Riccardi - initial implementation
 *  2011-03-25 Marco Riccardi - implementation of visitor pattern
 *
 */
package org.mizartools.system.xml;

import java.util.LinkedList;

import org.mizartools.system.ElementParseException;
import org.mizartools.system.IElement;
import org.mizartools.system.INode;
import org.mizartools.utility.xml.XMLAttribute;
import org.mizartools.utility.xml.XMLElement;

public class SupposeBlock implements IElement {

    public static final String NAME = "SupposeBlock";

    private INode parentNode;
    private Integer line = null;
    private Integer col = null;
    
    private boolean isBlockThesisFirst = false;

    private BlockThesis blockThesis = null;
    private Suppose suppose = null;
    private Thesis thesis = null;
    private LinkedList<ReasoningItem> reasoningItemList = new LinkedList<ReasoningItem>();

    private PerCasesReasoning perCasesReasoning = null;
    private EndPosition endPosition = null;

    private SupposeBlock(INode parentNode){
        this.parentNode = parentNode;
    }

    public INode getParentNode() {
        return parentNode;
    }

    public static SupposeBlock newInstance(INode parentNode, LinkedList<XMLElement> xmlElementList) throws ElementParseException {
        SupposeBlock supposeBlock = new SupposeBlock(parentNode);
        XMLElement xmlElement = xmlElementList.poll();
        if (!xmlElement.getName().equals(NAME)){
            throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a " + NAME, xmlElementList);
        }

        for (XMLAttribute xmlAttribute : xmlElement.getXMLAttributeList()){
        	if (xmlAttribute.getName().equals("line")){
                if (supposeBlock.line == null){
                    try {supposeBlock.line = Integer.parseInt(xmlAttribute.getValue());}
                    catch (Exception e) {throw new ElementParseException(ElementParseException.NOT_VALID_TYPE_OF_ATTRIBUTE_ELEMENT, "XMLElement has an attribute " + xmlAttribute.getName() + " with an invalid type", xmlElementList);};
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
        	} else 
        	if (xmlAttribute.getName().equals("col")){
                if (supposeBlock.col == null){
                    try {supposeBlock.col = Integer.parseInt(xmlAttribute.getValue());}
                    catch (Exception e) {throw new ElementParseException(ElementParseException.NOT_VALID_TYPE_OF_ATTRIBUTE_ELEMENT, "XMLElement has an attribute " + xmlAttribute.getName() + " with an invalid type", xmlElementList);};
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
        	} else 
        		throw new ElementParseException(ElementParseException.NOT_VALID_ATTRIBUTE_ELEMENT, "XMLElement has not a valid attribute " + xmlAttribute.getName(), xmlElementList);
        }
        
        if (!xmlElement.isEmpty()){
        	boolean isFirst = true;
            while (true){
                xmlElement = xmlElementList.peek();
                if (xmlElement == null){
                    throw new ElementParseException(ElementParseException.UNEXPECTED_END_OF_FILE, "Unexpected end of XMLElement list");
                }
                if (xmlElement.getName().equals(NAME) && xmlElement.isEndElement()){
                    xmlElement = xmlElementList.poll();
                    break;
                }
                if (isFirst) {
                    if (xmlElement.getName().equals("BlockThesis")){
                    	supposeBlock.isBlockThesisFirst = true;	
                    }
                	isFirst = false;
                }
                if (xmlElement.getName().equals("BlockThesis")){
                    if (supposeBlock.blockThesis == null) {
                        supposeBlock.blockThesis = BlockThesis.newInstance(supposeBlock, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <BlockThesis> in element " + NAME, xmlElementList);
                    }
                } else if (xmlElement.getName().equals("Suppose")){
                    if (supposeBlock.suppose == null) {
                        supposeBlock.suppose = Suppose.newInstance(supposeBlock, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <Suppose> in element " + NAME, xmlElementList);
                    }
                } else if (xmlElement.getName().equals("Thesis")){
                    if (supposeBlock.thesis == null) {
                        supposeBlock.thesis = Thesis.newInstance(supposeBlock, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <Thesis> in element " + NAME, xmlElementList);
                    }
                } else if (ReasoningItem.isReasoningItem(xmlElement.getName())){
                    supposeBlock.reasoningItemList.add(ReasoningItem.newInstance(supposeBlock, xmlElementList));
                } else if (xmlElement.getName().equals("PerCasesReasoning")){
                    if (supposeBlock.perCasesReasoning == null) {
                    	supposeBlock.perCasesReasoning = PerCasesReasoning.newInstance(supposeBlock, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <PerCasesReasoning> in element " + NAME, xmlElementList);
                    }
                } else if (xmlElement.getName().equals("EndPosition")){
                    if (supposeBlock.endPosition == null) {
                        supposeBlock.endPosition = EndPosition.newInstance(supposeBlock, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <EndPosition> in element " + NAME, xmlElementList);
                    }
                } else 
                    throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "The XMLElement " + xmlElement.getName() + " is not valid in " + NAME, xmlElementList);
            }
        }

        return supposeBlock;
    }

    public LinkedList<XMLElement> getXMLElementList() {
        LinkedList<XMLElement> xmlElementList = new LinkedList<XMLElement>();
        XMLElement xmlElement = new XMLElement(NAME);
        if (this.line != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("line", this.line);
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        if (this.col != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("col", this.col);
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        boolean isEmpty = (blockThesis == null
         && suppose == null && thesis == null
         && reasoningItemList.isEmpty() && endPosition == null);
        xmlElement.setEmpty(isEmpty);
        xmlElementList.add(xmlElement);
        if (this.isBlockThesisFirst){
            if (this.blockThesis != null){
                xmlElementList.addAll(this.blockThesis.getXMLElementList());
            }
            if (this.suppose != null){
                xmlElementList.addAll(this.suppose.getXMLElementList());
            }
            if (this.thesis != null){
                xmlElementList.addAll(this.thesis.getXMLElementList());
            }
            for (ReasoningItem reasoningItem : reasoningItemList){
                xmlElementList.addAll(reasoningItem.getXMLElementList());
            }
            if (this.perCasesReasoning != null){
                xmlElementList.addAll(this.perCasesReasoning.getXMLElementList());
            }
            if (this.endPosition != null){
                xmlElementList.addAll(this.endPosition.getXMLElementList());
            }
        } else {
            if (this.suppose != null){
                xmlElementList.addAll(this.suppose.getXMLElementList());
            }
            for (ReasoningItem reasoningItem : reasoningItemList){
                xmlElementList.addAll(reasoningItem.getXMLElementList());
            }
            if (this.perCasesReasoning != null){
                xmlElementList.addAll(this.perCasesReasoning.getXMLElementList());
            }
            if (this.endPosition != null){
                xmlElementList.addAll(this.endPosition.getXMLElementList());
            }
            if (this.blockThesis != null){
                xmlElementList.addAll(this.blockThesis.getXMLElementList());
            }
        }
        if (!isEmpty) { 
            xmlElement = new XMLElement(NAME);
            xmlElement.setEndElement(true);
            xmlElementList.add(xmlElement);
        }
        return xmlElementList;
    }

    public BlockThesis getBlockThesis(){
        return blockThesis;
    }

    public Suppose getSuppose(){
        return suppose;
    }

    public Thesis getThesis(){
        return thesis;
    }

    public PerCasesReasoning getPerCasesReasoning(){
        return perCasesReasoning;
    }

    public LinkedList<ReasoningItem> getReasoningItemList(){
        return reasoningItemList;
    }

	public Integer getLine() {
		return line;
	}

	public Integer getCol() {
		return col;
	}

	public boolean isBlockThesisFirst() {
		return isBlockThesisFirst;
	}

	public EndPosition getEndPosition() {
		return endPosition;
	}

	@Override
	public void accept(Visitor visitor) {
		if (visitor.visit(this)) {
			for(ReasoningItem reasoningItem: this.reasoningItemList) {
				reasoningItem.accept(visitor);
			}
		}
		visitor.endVisit(this);
	}

	@Override
	public String toString(){
		ToStringVisitor toStringVisitor = new ToStringVisitor();
		this.accept(toStringVisitor);
		return toStringVisitor.toString();
	}
    
}
